<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>功能实现</title>
		<script src="../js/jquery-1.11.1.js"></script>
		<style>
			div{
				width: 500px;
				height: 500px;
				background: #ff0;
				display: none;
			}
		</style>
	</head>
	<body>
		<button>按钮</button>
		<div></div>
		<script>
			$("button").click(function(){
				//隐藏：css属性直接给元素设置
				$("div").css("display","block").css("border-radius","50%").css("background","#f00");
			});
		</script>
	</body>
</html>